A dielectric dual-mode resonator hybrid filter

Abstract

The utility model relates to a kind of medium bimodulus resonator and metal resonator hybrid filter, including central resonant cavity and two side resonant cavities, central resonant cavity is housed with cylindrical medium bimodulus resonator and vertical flat piece shape bimodulus resonator coupling rib;Medium bimodulus resonator is equipped with an installation hole, a coupling hole and two frequency through holes, bimodulus resonator coupling rib is below medium bimodulus resonator and with the axis of installation hole as center mirror image symmetry.The utility model can change the polarity of coupling between bimodulus resonance by rotating bimodulus resonator coupling rib, after polarity conversion, filter passband left and right each produces a zero point, more application scenarios can be applied, and it has smaller volume.In the patent, only three resonators are needed to make the passband have two zero points, so the space is more saved.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to a hybrid filter of dielectric dual-mode resonator and metal resonator. Background Technology

[0002] With the development of modern wireless communication and related industries, the demand for miniaturized filters and duplexers is increasing. Dielectric dual-mode resonators are a type of resonator with two resonant modes; one dielectric dual-mode resonator can realize two single-mode dielectric resonators or two metal resonators. Dielectric dual-mode resonators can significantly reduce the size of traditional mode filters.

[0003] Chinese patent CN114039187B discloses a dielectric dual-mode resonator, which is a cylindrical dielectric dual-mode resonator with a first end face and a second end face arranged opposite to each other. A groove is formed on the first end face that does not penetrate the second end face, and the groove is used to change the coupling polarity between the two resonant modes of the dielectric dual-mode resonator. The dielectric dual-mode resonator provided in this application is advantageous for independently controlling the coupling polarity between the two resonant modes, thereby facilitating the control of the position of the transmission zero of the filter using the dielectric dual-mode resonator provided in this application. However, it only has one zero on one side of the filter's passband, limiting its application range.

[0004] Therefore, a new filter needs to be designed to expand its application scenarios. Utility Model Content

[0005] The main purpose of this invention is to provide a hybrid filter of dielectric dual-mode resonator and metal resonator, which can generate a zero on both sides of the filter passband after polarity conversion, making it applicable to more application scenarios and having a smaller size.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a hybrid filter of dielectric dual-mode resonator and metal resonator, comprising a central resonant cavity and two side resonant cavities mirror-symmetrically arranged on both sides of the central resonant cavity. The central resonant cavity houses a cylindrical dielectric dual-mode resonator and a vertically flat dual-mode resonant coupling rib. The dielectric dual-mode resonator has a mounting hole, a coupling hole, and two frequency through holes. The mounting hole is located on the central axis of the dielectric dual-mode resonator. The center distance from the coupling hole to the mounting hole is equal to the center distance from each frequency through hole to the mounting hole. The central angle between the centers of the two frequency through holes is 90°, and the central angle between the center of each frequency through hole and the center of the coupling hole is 135°. A first metal coupling screw is coaxially arranged in the coupling hole, and a first metal frequency screw is coaxially arranged in each frequency through hole. The dual-mode resonant coupling rib is located below the dielectric dual-mode resonator and mirror-symmetrically arranged with the axis of the mounting hole as the center. Each side resonant cavity has a metal resonator and a second metal frequency screw coaxially arranged.

[0007] Specifically, the center of the dual-mode resonant coupling bar has a cylindrical base, and the lower part of the dielectric dual-mode resonator and the upper part of the base are separated by an insulating support.

[0008] Specifically, each metal resonator has a coupling rib extending to the bottom of the dielectric dual-mode resonator on its outer periphery.

[0009] Specifically, each coupling rib is provided with an adjustable height metal coupling ring above it. The coupling rib and the metal coupling ring do not contact each other. The metal coupling ring has an upward-opening U-shaped structure.

[0010] Furthermore, the inner side of the metal coupling ring is provided with a second metal coupling screw with adjustable height, and the second metal coupling screw does not contact the metal coupling ring.

[0011] The beneficial effects of this utility model's technical solution are: 1. This patent can change the polarity of the coupling between two-mode resonators by rotating the dual-mode resonant coupling rib. After the polarity is reversed, a zero is generated on both the left and right sides of the filter passband, which can be applied to more application scenarios. 2. This patent only requires three resonators to create two zeros on both sides of the passband, thus saving more space. Attached Figure Description

[0012] Figure 1 This is a diagram of the internal structure of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the first resonant mode. Figure 2 This is a three-dimensional view of the internal components of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the first resonant mode. Figure 3 This is a top view of the internal components of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the first resonant mode. Figure 4 This is a front view of the internal components of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the first resonant mode. Figure 5 This diagram shows the positional relationship between the dielectric dual-mode resonator, the dual-mode resonant coupling rib, and the support base in the first resonant mode. Figure 6 The waveform diagram of the response of the hybrid filter of dielectric dual-mode resonator and metal resonator in the first resonance mode; Figure 7 This is a three-dimensional view of the internal components of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the second resonant mode. Figure 8 The waveform diagram shows the response of a hybrid filter combining a dielectric dual-mode resonator and a metal resonator in the second resonant mode.

[0013] The numbers in the diagram represent: 1a - Central resonant cavity, 1b - Side resonant cavity; 2-Dielectric dual-mode resonator, 21-Mounting hole, 22-Coupled hole, 23-Frequency through hole; 3-Dual-mode resonant coupling rib, 31-Base platform; 4-Metal resonator, 41-Coupled rib; 5a - First metal coupling screw, 5b - First metal frequency screw, 5c - Second metal frequency screw, 5d - Second metal coupling screw; 6-Support base; 7-Metallic coupling ring. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to specific embodiments.

[0015] Example: like Figures 1 to 5As shown, this utility model discloses a hybrid filter combining a dielectric dual-mode resonator and a metal resonator, comprising a central resonant cavity 1a and two side resonant cavities 1b mirror-symmetrically arranged on both sides of the central resonant cavity 1a. The central resonant cavity 1a houses a cylindrical dielectric dual-mode resonator 2 and vertically flat dual-mode resonant coupling ribs 3. The dielectric dual-mode resonator 2 has a mounting hole 21, a coupling hole 22, and two frequency through-holes 23. The mounting hole 21 is located on the central axis of the dielectric dual-mode resonator 2, and the center-to-center distance from the coupling hole 22 to the mounting hole 21 is equal to the distance from each frequency through-hole 23 to the center-to-center distance of the coupling hole 22 to the mounting hole 21. The center distance between the mounting holes 21 and the center angle between the centers of the two frequency through holes 23 is 90°, and the center angle between the center of each frequency through hole 23 and the center of the coupling hole 22 is 135°. A first metal coupling screw 5a is coaxially arranged in the coupling hole 22, and a first metal frequency screw 5b is coaxially arranged in each frequency through hole 23. The dual-mode resonant coupling rib 3 is located below the dielectric dual-mode resonator 2 and is mirror-symmetrical about the axis of the mounting hole 21. Each side resonant cavity 1b has a metal resonator 4 and a second metal frequency screw 5c coaxially arranged. The coupling hole 22 can be a through hole or a blind hole.

[0016] The first metal coupling screw 5a adjusts the coupling magnitude by changing its depth, and the second metal frequency screw 5c is used to adjust the filter's bandwidth. The dual-mode resonant coupling rib 3 can switch between two resonant modes: in the first resonant mode, the internal component structure of the hybrid filter combining the dielectric dual-mode resonator and the metal resonator is as follows... Figure 2 As shown, its response waveform is as follows. Figure 6 As shown; in the second resonant mode, the internal component structure of the hybrid filter of dielectric dual-mode resonator and metal resonator is as follows. Figure 7 As shown, the dual-mode resonant coupling ligament 3 is rotated by 90°, causing a polarity reversal in the coupling. Its response waveform is shown below. Figure 8 As shown, this filter generates one zero on each side of the passband, making it applicable to more scenarios than CN114039187B. Ordinary filters require four resonators to achieve two zeros, while this patent only requires three resonators to achieve two zeros on each side of the passband, thus saving space and effectively reducing product size by 20%-30%.

[0017] like Figure 2 , Figure 4 and Figure 5 As shown, the center of the dual-mode resonant coupling bar 3 has a cylindrical base 31. The lower part of the dielectric dual-mode resonator 2 and the upper part of the base 31 are separated by an insulated support 6. The support 6 guides the base 31 to rotate around the axis of the mounting hole 21.

[0018] Because the base 31 is located at the center of the dual-mode resonant coupling rib 3, and the dual-mode resonant coupling rib 3 itself is mirror-symmetrical about the axis of the mounting hole 21, the axis of the base 31 and the axis of the mounting hole 21 are coaxial. The dielectric dual-mode resonator 2 and the dual-mode resonant coupling rib 3 are not directly electrically connected, so the support 6 must separate the two on the one hand, and restrict the base 31 to rotate only within the circular area on the other hand.

[0019] like Figures 2 to 4 As shown, each metal resonator 4 has a coupling rib 41 extending to the bottom of the dielectric dual-mode resonator 2 on its outer periphery.

[0020] The coupling rib 41 is equivalent to a wire that brings the metal resonator 4 closer to the dielectric dual-mode resonator 2, and plays a role in changing the coupling amount. Specifically, increasing the height of the coupling rib 41 will increase the coupling amount, and decreasing it will decrease the coupling amount.

[0021] like Figures 1 to 4 As shown, each coupling rib 41 is provided with an adjustable height metal coupling ring 7 above it. The coupling rib 41 does not contact the metal coupling ring 7. The metal coupling ring 7 has an upward-opening U-shaped structure. The inner side of the metal coupling ring 7 is provided with an adjustable height second metal coupling screw 5d. The second metal coupling screw 5d does not contact the metal coupling ring 7.

[0022] The above structure provides three ways to adjust the coupling size: one is by adjusting the depth of the metal coupling ring 7 into the cavity, another is by adjusting the depth of the second metal coupling screw 5d into the cavity, and the third is by adjusting the height of the coupling rib 41.

[0023] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A hybrid filter combining a dielectric dual-mode resonator and a metal resonator, characterized in that: The system includes a central resonant cavity and two side resonant cavities mirror-symmetrically arranged on either side of the central resonant cavity. The central resonant cavity houses a cylindrical dielectric dual-mode resonator and a vertically flat dual-mode resonant coupling rib. The dielectric dual-mode resonator has a mounting hole, a coupling hole, and two frequency through-holes. The mounting hole is located on the central axis of the dielectric dual-mode resonator. The center-to-center distance from the coupling hole to the mounting hole is equal to the center-to-center distance from each frequency through-hole to the mounting hole. The central angle between the centers of the two frequency through-holes is 90°, and the central angle between the center of each frequency through-hole and the center of the coupling hole is 135°. A first metal coupling screw is coaxially arranged within the coupling hole, and a first metal frequency screw is coaxially arranged within each frequency through-hole. The dual-mode resonant coupling rib is located below the dielectric dual-mode resonator and mirror-symmetrically arranged with the axis of the mounting hole as the center. Each side resonant cavity contains a coaxially arranged metal resonator and a second metal frequency screw.

2. The hybrid filter of dielectric dual-mode resonator and metal resonator according to claim 1, characterized in that: The dual-mode resonant coupling bar has a cylindrical base at its center, and the lower part of the dielectric dual-mode resonator is separated from the upper part of the base by an insulated support.

3. The hybrid filter of dielectric dual-mode resonator and metal resonator according to claim 1, characterized in that: Each metal resonator has a coupling rib extending to the bottom of the dielectric dual-mode resonator on its outer periphery.

4. The hybrid filter of dielectric dual-mode resonator and metal resonator according to claim 1, characterized in that: Each coupling rib is provided with an adjustable height metal coupling ring above it. The coupling rib does not contact the metal coupling ring, and the metal coupling ring has an upward-opening U-shaped structure.

5. The hybrid filter of dielectric dual-mode resonator and metal resonator according to claim 4, characterized in that: The inner side of the metal coupling ring is provided with a second metal coupling screw with adjustable height, and the second metal coupling screw does not contact the metal coupling ring.

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